I took the index of the words, converted the amount to binary, extra a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, added 3 zeros into the eight digits of the binary and got 00000010011 which translates to 19 in https://fatallisto.com/story8548514/a-secret-weapon-for-bip39-words-to-numbers